C# and Java are kind of in the same space, they tend to pick up the same kind of features. But not always in the same way e.g. Records are different between the two languages. As is the path to Async.

Java benefits from more experimentation in the JVM and bigger variety in implementers.

I need to find the funny slide deck by Brian Goetz (java language architect at Oracle) where in slide one (what industry thinks he does) he shows his job is to copy from C# and in slide two he shows what academia thinks he does, copy from scala ;)

It is not this presentation, https://www.infoq.com/presentations/java-futures-2019/ but it is close in content.

In the list provided in the article: record syntax, switch expressions and var.

And by the way for the downvoters: there wasn’t any snark, C# itself being at first a copy-pasta from Java, and now taking heavy inspiration from F#. That kind of features transfer in-between languages is a good thing.

Java employs the “last mover advantage” strategy. They wait a bit for other mainstream-ish languages to be a testbed for a new feature, and if it proves worthwhile, they try to incorporate it into the language. But a new feature is a huge responsibility, since it will have to be maintained “forever”.

C# on the other hand is quite brave and quick to implement everything under the Sun, sort of similarly to c++ - which sooner or later will create a really bloated language (imo, both are already quite complicated). And in backward compatibility, Java definitely wins the cake.